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Turunan kedua dari fungsi f ( x ) = e x cos x adalah ....

Turunan kedua dari fungsi adalah ....

  1. begin mathsize 14px style straight f " left parenthesis straight x right parenthesis equals straight e to the power of straight x left parenthesis cos space straight x minus sin space straight x right parenthesis end style  

  2. begin mathsize 14px style straight f " left parenthesis straight x right parenthesis equals negative 2 straight e to the power of straight x space sin space straight x end style  

  3. begin mathsize 14px style straight f " left parenthesis straight x right parenthesis equals negative 2 straight e to the power of straight x space cos space straight x end style  

  4. begin mathsize 14px style straight f " left parenthesis straight x right parenthesis equals 2 straight e to the power of straight x space sin space straight x end style  

  5. begin mathsize 14px style straight f " left parenthesis straight x right parenthesis equals 2 straight e to the power of straight x space cos space straight x end style  

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S. Intan

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

Jawaban terverifikasi

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Pembahasan

Ingat bahwa turunan pertama dari f(x) = u(x)v(x) adalah f'(x) =u'(x)v(x) + u(x)v'(x) Misalkan dan v(x) = cos⁡ x, maka didapat dan v'(x) = - sin ⁡x. Oleh karena itu, didapat Kemudian, misalkan dan q(x) = cos ⁡ x - sin ⁡x. Didapat bahwa dan q'(x) = - sin ⁡x - cos ⁡x. Perhatikan bahwa Jadi, jawaban yang tepat adalah B.

Ingat bahwa turunan pertama dari f(x) = u(x)v(x) adalah 
f'(x) =u'(x)v(x) + u(x)v'(x)

Misalkan begin mathsize 14px style straight u left parenthesis straight x right parenthesis equals straight e to the power of straight x end style dan v(x) = cos⁡ x, maka didapat begin mathsize 14px style straight u to the power of apostrophe left parenthesis straight x right parenthesis equals straight e to the power of straight x end style dan v'(x) = - sin ⁡x. Oleh karena itu, didapat

begin mathsize 14px style straight f left parenthesis straight x right parenthesis equals straight e to the power of straight x cos space straight x straight f left parenthesis straight x right parenthesis equals straight u left parenthesis straight x right parenthesis straight v left parenthesis straight x right parenthesis straight f to the power of apostrophe left parenthesis straight x right parenthesis equals straight u to the power of apostrophe left parenthesis straight x right parenthesis straight v left parenthesis straight x right parenthesis plus straight u left parenthesis straight x right parenthesis straight v to the power of apostrophe left parenthesis straight x right parenthesis straight f to the power of apostrophe left parenthesis straight x right parenthesis equals straight e to the power of straight x left parenthesis cos space straight x right parenthesis plus straight e to the power of straight x left parenthesis negative sin space straight x right parenthesis straight f to the power of apostrophe left parenthesis straight x right parenthesis equals straight e to the power of straight x left parenthesis cos space straight x minus sin space straight x right parenthesis end style    

Kemudian, misalkan begin mathsize 14px style straight p left parenthesis straight x right parenthesis equals straight e to the power of straight x end style dan q(x) = cos ⁡ x - sin ⁡x.
Didapat bahwa begin mathsize 14px style straight p to the power of apostrophe left parenthesis straight x right parenthesis equals straight e to the power of straight x end style dan q'(x) = - sin ⁡x - cos ⁡x.

Perhatikan bahwa
begin mathsize 14px style straight f to the power of apostrophe left parenthesis straight x right parenthesis equals straight e to the power of straight x left parenthesis cos space straight x minus sin space straight x right parenthesis straight f to the power of apostrophe left parenthesis straight x right parenthesis equals straight p left parenthesis straight x right parenthesis straight q left parenthesis straight x right parenthesis straight f " left parenthesis straight x right parenthesis equals straight p to the power of apostrophe left parenthesis straight x right parenthesis straight q left parenthesis straight x right parenthesis plus straight p left parenthesis straight x right parenthesis straight q to the power of apostrophe left parenthesis straight x right parenthesis straight f " left parenthesis straight x right parenthesis equals straight e to the power of straight x left parenthesis cos space straight x minus sin space straight x right parenthesis plus straight e to the power of straight x left parenthesis negative sin space straight x minus cos space straight x right parenthesis straight f " left parenthesis straight x right parenthesis equals straight e to the power of straight x left parenthesis left parenthesis cos space straight x minus sin space straight x right parenthesis plus left parenthesis negative sin space straight x minus cos space straight x right parenthesis right parenthesis straight f " left parenthesis straight x right parenthesis equals straight e to the power of straight x left parenthesis negative 2 space sin space straight x right parenthesis straight f " left parenthesis straight x right parenthesis equals negative 2 straight e to the power of straight x space sin space straight x end style    

Jadi, jawaban yang tepat adalah B. 

 

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